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A211960
Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-4
0
0, 0, 65, 3146, 64705, 695587, 4904333, 25825865, 109813056, 396433235, 1257315972, 3589635788, 9392825390
OFFSET
1,3
COMMENTS
Column 3 of A211963
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.2......0.1......1.2......1.2......1.2......1.2......1.2......1.2
..0.3.4....2.3.4....1.3.4....3.4.5....3.4.5....3.3.4....3.4.5....3.4.5
..5.6.7.6..0.5.6.0..5.2.5.6..0.6.6.0..5.6.0.4..5.6.6.1..5.2.1.6..5.0.5.6
CROSSREFS
Sequence in context: A237858 A075474 A069225 * A293695 A133853 A188693
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 26 2012
STATUS
approved